blob: e599ba2f950d72e03c4bc98f7b1a9b86742134e7 [file] [log] [blame]
Andy Grover55b7ed02009-02-24 15:30:37 +00001/*
2 * Copyright (c) 2009 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <rdma/rdma_cm.h>
34
35#include "rdma_transport.h"
36
Andy Grover11bc9422009-04-09 14:09:37 +000037static struct rdma_cm_id *rds_rdma_listen_id;
Andy Grover55b7ed02009-02-24 15:30:37 +000038
39int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
40 struct rdma_cm_event *event)
41{
42 /* this can be null in the listening path */
43 struct rds_connection *conn = cm_id->context;
44 struct rds_transport *trans;
45 int ret = 0;
46
47 rdsdebug("conn %p id %p handling event %u\n", conn, cm_id,
48 event->event);
49
50 if (cm_id->device->node_type == RDMA_NODE_RNIC)
51 trans = &rds_iw_transport;
52 else
53 trans = &rds_ib_transport;
54
55 /* Prevent shutdown from tearing down the connection
56 * while we're executing. */
57 if (conn) {
58 mutex_lock(&conn->c_cm_lock);
59
60 /* If the connection is being shut down, bail out
61 * right away. We return 0 so cm_id doesn't get
62 * destroyed prematurely */
63 if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
64 /* Reject incoming connections while we're tearing
65 * down an existing one. */
66 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
67 ret = 1;
68 goto out;
69 }
70 }
71
72 switch (event->event) {
73 case RDMA_CM_EVENT_CONNECT_REQUEST:
74 ret = trans->cm_handle_connect(cm_id, event);
75 break;
76
77 case RDMA_CM_EVENT_ADDR_RESOLVED:
78 /* XXX do we need to clean up if this fails? */
79 ret = rdma_resolve_route(cm_id,
80 RDS_RDMA_RESOLVE_TIMEOUT_MS);
81 break;
82
83 case RDMA_CM_EVENT_ROUTE_RESOLVED:
84 /* XXX worry about racing with listen acceptance */
85 ret = trans->cm_initiate_connect(cm_id);
86 break;
87
88 case RDMA_CM_EVENT_ESTABLISHED:
89 trans->cm_connect_complete(conn, event);
90 break;
91
92 case RDMA_CM_EVENT_ADDR_ERROR:
93 case RDMA_CM_EVENT_ROUTE_ERROR:
94 case RDMA_CM_EVENT_CONNECT_ERROR:
95 case RDMA_CM_EVENT_UNREACHABLE:
96 case RDMA_CM_EVENT_REJECTED:
97 case RDMA_CM_EVENT_DEVICE_REMOVAL:
98 case RDMA_CM_EVENT_ADDR_CHANGE:
99 if (conn)
100 rds_conn_drop(conn);
101 break;
102
103 case RDMA_CM_EVENT_DISCONNECTED:
Andy Grover97069782010-03-11 13:50:02 +0000104 rdsdebug("DISCONNECT event - dropping connection "
Andy Grover55b7ed02009-02-24 15:30:37 +0000105 "%pI4->%pI4\n", &conn->c_laddr,
106 &conn->c_faddr);
107 rds_conn_drop(conn);
108 break;
109
110 default:
111 /* things like device disconnect? */
Andy Grover735f61e2010-03-11 13:49:55 +0000112 printk(KERN_ERR "RDS: unknown event %u!\n", event->event);
Andy Grover55b7ed02009-02-24 15:30:37 +0000113 break;
114 }
115
116out:
117 if (conn)
118 mutex_unlock(&conn->c_cm_lock);
119
120 rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
121
122 return ret;
123}
124
125static int __init rds_rdma_listen_init(void)
126{
127 struct sockaddr_in sin;
128 struct rdma_cm_id *cm_id;
129 int ret;
130
131 cm_id = rdma_create_id(rds_rdma_cm_event_handler, NULL, RDMA_PS_TCP);
132 if (IS_ERR(cm_id)) {
133 ret = PTR_ERR(cm_id);
Andy Grover92c330b2009-07-17 13:13:26 +0000134 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
Andy Grover55b7ed02009-02-24 15:30:37 +0000135 "rdma_create_id() returned %d\n", ret);
Dan Carpenter24acc682010-04-21 23:55:27 +0000136 return ret;
Andy Grover55b7ed02009-02-24 15:30:37 +0000137 }
138
Julia Lawall3d7ddd52009-08-05 20:30:13 -0700139 sin.sin_family = AF_INET,
Andy Grover55b7ed02009-02-24 15:30:37 +0000140 sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
141 sin.sin_port = (__force u16)htons(RDS_PORT);
142
143 /*
144 * XXX I bet this binds the cm_id to a device. If we want to support
145 * fail-over we'll have to take this into consideration.
146 */
147 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
148 if (ret) {
Andy Grover92c330b2009-07-17 13:13:26 +0000149 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
Andy Grover55b7ed02009-02-24 15:30:37 +0000150 "rdma_bind_addr() returned %d\n", ret);
151 goto out;
152 }
153
154 ret = rdma_listen(cm_id, 128);
155 if (ret) {
Andy Grover92c330b2009-07-17 13:13:26 +0000156 printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
Andy Grover55b7ed02009-02-24 15:30:37 +0000157 "rdma_listen() returned %d\n", ret);
158 goto out;
159 }
160
161 rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
162
Andy Grover11bc9422009-04-09 14:09:37 +0000163 rds_rdma_listen_id = cm_id;
Andy Grover55b7ed02009-02-24 15:30:37 +0000164 cm_id = NULL;
165out:
166 if (cm_id)
167 rdma_destroy_id(cm_id);
168 return ret;
169}
170
171static void rds_rdma_listen_stop(void)
172{
Andy Grover11bc9422009-04-09 14:09:37 +0000173 if (rds_rdma_listen_id) {
174 rdsdebug("cm %p\n", rds_rdma_listen_id);
175 rdma_destroy_id(rds_rdma_listen_id);
176 rds_rdma_listen_id = NULL;
Andy Grover55b7ed02009-02-24 15:30:37 +0000177 }
178}
179
180int __init rds_rdma_init(void)
181{
182 int ret;
183
184 ret = rds_rdma_listen_init();
185 if (ret)
186 goto out;
187
188 ret = rds_iw_init();
189 if (ret)
190 goto err_iw_init;
191
192 ret = rds_ib_init();
193 if (ret)
194 goto err_ib_init;
195
196 goto out;
197
198err_ib_init:
199 rds_iw_exit();
200err_iw_init:
201 rds_rdma_listen_stop();
202out:
203 return ret;
204}
Andy Grover40d86602009-08-21 12:28:33 +0000205module_init(rds_rdma_init);
Andy Grover55b7ed02009-02-24 15:30:37 +0000206
207void rds_rdma_exit(void)
208{
209 /* stop listening first to ensure no new connections are attempted */
210 rds_rdma_listen_stop();
211 rds_ib_exit();
212 rds_iw_exit();
213}
Andy Grover40d86602009-08-21 12:28:33 +0000214module_exit(rds_rdma_exit);
215
216MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
217MODULE_DESCRIPTION("RDS: IB/iWARP transport");
218MODULE_LICENSE("Dual BSD/GPL");
Andy Grover55b7ed02009-02-24 15:30:37 +0000219